The construction company, G & T Crampton Limited has been fined €50,000 for negligence which led to the death of a man on a building site in Ringsend, Dublin, in 2002.
Thomas O'Neill, a 31-year-old father-of-two from Lucan, died after three flights of a concrete stairs, weighing two tonnes each, collapsed.
A design flaw in the bolts holding the staircase to the walls of the building at the South Lotts Office Development was blamed for the collapse.
G & T Crampton pleaded guilty to directing persons to work in the vicinity of the stairwell in circumstances where it ought to have known that it was unsafe.